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10 April 2003 <br /> AGE-NC Project No 99-0559 <br /> Page 4of8 <br />' HUl and HU2 <br /> During the January 2003 sampling event, the depth to ground water from monitoring wells MW-1 <br /> through MW-4 and MW-5A through MW-8A ranged from 57 95 to 59 77 feet below casing grade <br /> However,the depth to ground water(59 83 feet) at well MW-2 was affected by the presence of free <br />' product, the depth was recalculated(59 77 feet) utilizing the measured thickness of free product in <br /> well MW-2 <br />' DW=Dm - (tg * dVd,,,) <br /> D,, = Corrected depth to water <br /> Dm =Measured depth to water <br /> tg=Total thickness of free product (-0 012 foot) <br /> dg =Density of free product (gasoline at ---0 88 g/ml) <br /> d,=Density of water (-10 gm/ml) <br /> Ground water elevation data collected from monitoring wells MW-1 through MW-4, and MW-5A <br /> through MW-8A ranged between 33 30 feet(MW-8A)and 34 63 feet(MW-2)below mean sea level <br /> (MSL) Ground water elevation increased approximately 3 feet over the last quarter The top of the <br /> ground water table was within the screened intervals of the wells <br /> I At the time of the January2003 monitoring event the otentiometric surface based on HU 1 and HU2 <br /> g p <br /> wells inferred an asymmetric, west flowing ground water trough with a hydraulic gradient of 0 003 <br /> feet to 0 03 ft/ft at the former UST location(Figure 3), faster ground water flow was inferred along <br /> the northern limb of the trough <br /> I <br /> HU3 and HU4 <br /> In the wells representing HU3 and HU4, the depth to ground water ranged from 58 52 to 60 78 feet <br /> below casing grade Ground water elevation data collected from monitoring wells MW-5B through <br /> 1 MW-8B ranged between 33 50 feet (MW-6B) and 34 71 feet (MW-5B) below MSL, based on the <br /> monitoring wells screened in HU3 and HU4, ground water was inferred to be flowing primarily <br /> toward the north away from the farmer UST with a hydraulic gradient of 0 02 to 0 03 f11f1(Figure 4) <br /> HU5 <br /> Within the upper portion of HU5 (Upper HU5), screened between 125 and 135 feet bsg, ground <br /> . water elevation data collected from monitoring wells MW-5C through MW-7C ranged between <br /> Advanced GeoEnvironmental,Inc <br />